It used to be relatively easy and straightforward to navigate the fall and winter respiratory disease season in the U.S.—get a flu shot. Then came COVID-19, and another vaccine was added to the mix. Now, for the first time, there will be a third shot for some groups: a vaccine for respiratory syncytial virus (RSV), which causes respiratory disease that can be especially dangerous for infants and older people. [time-brightcove not-tgx=”true”] Here’s what experts say about who should be receiving which shots, and when. Flu (the easy one) The advice here is straightforward and the same as it’s always been: “Everybody should be getting a flu shot,” says Dr.